Contributors: 35
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Linus Torvalds (pre-git) |
262 |
21.60% |
9 |
9.00% |
| Eric W. Biedermann |
230 |
18.96% |
20 |
20.00% |
| Joel Granados |
169 |
13.93% |
19 |
19.00% |
| Al Viro |
85 |
7.01% |
6 |
6.00% |
| Lucas De Marchi |
73 |
6.02% |
1 |
1.00% |
| Luis R. Rodriguez |
60 |
4.95% |
6 |
6.00% |
| Linus Torvalds |
51 |
4.20% |
1 |
1.00% |
| nixiaoming |
50 |
4.12% |
2 |
2.00% |
| Christoph Hellwig |
35 |
2.89% |
2 |
2.00% |
| Hideaki Yoshifuji / 吉藤英明 |
24 |
1.98% |
2 |
2.00% |
| Krister Johansen |
22 |
1.81% |
1 |
1.00% |
| Pavel Emelyanov |
18 |
1.48% |
1 |
1.00% |
| Dmitry Torokhov |
16 |
1.32% |
1 |
1.00% |
| Arnd Bergmann |
15 |
1.24% |
1 |
1.00% |
| Matteo Croce |
14 |
1.15% |
1 |
1.00% |
| Thomas Weißschuh |
13 |
1.07% |
6 |
6.00% |
| Song Muchun |
12 |
0.99% |
1 |
1.00% |
| Vlastimil Babka |
11 |
0.91% |
1 |
1.00% |
| Eric Dumazet |
7 |
0.58% |
2 |
2.00% |
| Tonghao Zhang |
5 |
0.41% |
1 |
1.00% |
| David Howells |
5 |
0.41% |
1 |
1.00% |
| Subash Abhinov Kasiviswanathan |
5 |
0.41% |
1 |
1.00% |
| Konstantin Khlebnikov |
4 |
0.33% |
1 |
1.00% |
| Heinrich Schuchardt |
4 |
0.33% |
1 |
1.00% |
| Matthew Wilcox |
4 |
0.33% |
1 |
1.00% |
| Jia He |
3 |
0.25% |
1 |
1.00% |
| Octavian Purdila |
3 |
0.25% |
1 |
1.00% |
| Andrew Morton |
3 |
0.25% |
2 |
2.00% |
| Yuwei Wang |
2 |
0.16% |
1 |
1.00% |
| Stephen Rothwell |
2 |
0.16% |
1 |
1.00% |
| Kirill Korotaev |
2 |
0.16% |
1 |
1.00% |
| Randy Dunlap |
1 |
0.08% |
1 |
1.00% |
| Greg Kroah-Hartman |
1 |
0.08% |
1 |
1.00% |
| Américo Wang |
1 |
0.08% |
1 |
1.00% |
| Kees Cook |
1 |
0.08% |
1 |
1.00% |
| Total |
1213 |
|
100 |
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* sysctl.h: General linux system control interface
*
* Begun 24 March 1995, Stephen Tweedie
*
****************************************************************
****************************************************************
**
** WARNING:
** The values in this file are exported to user space via
** the sysctl() binary interface. Do *NOT* change the
** numbering of any existing values here, and do not change
** any numbers within any one set of values. If you have to
** redefine an existing interface, use a new number for it.
** The kernel will then return -ENOTDIR to any application using
** the old binary interface.
**
****************************************************************
****************************************************************
*/
#ifndef _LINUX_SYSCTL_H
#define _LINUX_SYSCTL_H
#include <linux/list.h>
#include <linux/rcupdate.h>
#include <linux/wait.h>
#include <linux/rbtree.h>
#include <linux/uidgid.h>
#include <uapi/linux/sysctl.h>
/* For the /proc/sys support */
struct completion;
struct ctl_table;
struct nsproxy;
struct ctl_table_root;
struct ctl_table_header;
struct ctl_dir;
/* Keep the same order as in fs/proc/proc_sysctl.c */
#define SYSCTL_ZERO ((void *)&sysctl_vals[0])
#define SYSCTL_ONE ((void *)&sysctl_vals[1])
#define SYSCTL_TWO ((void *)&sysctl_vals[2])
#define SYSCTL_THREE ((void *)&sysctl_vals[3])
#define SYSCTL_FOUR ((void *)&sysctl_vals[4])
#define SYSCTL_ONE_HUNDRED ((void *)&sysctl_vals[5])
#define SYSCTL_TWO_HUNDRED ((void *)&sysctl_vals[6])
#define SYSCTL_ONE_THOUSAND ((void *)&sysctl_vals[7])
#define SYSCTL_THREE_THOUSAND ((void *)&sysctl_vals[8])
#define SYSCTL_INT_MAX ((void *)&sysctl_vals[9])
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
#define SYSCTL_MAXOLDUID ((void *)&sysctl_vals[10])
#define SYSCTL_NEG_ONE ((void *)&sysctl_vals[11])
extern const int sysctl_vals[];
#define SYSCTL_LONG_ZERO ((void *)&sysctl_long_vals[0])
#define SYSCTL_LONG_ONE ((void *)&sysctl_long_vals[1])
#define SYSCTL_LONG_MAX ((void *)&sysctl_long_vals[2])
#define SYSCTL_CONV_IDENTITY(val) (val)
/**
*
* "dir" originates from read_iter (dir = 0) or write_iter (dir = 1)
* in the file_operations struct at proc/proc_sysctl.c. Its value means
* one of two things for sysctl:
* 1. SYSCTL_USER_TO_KERN(dir) Writing to an internal kernel variable from user
* space (dir > 0)
* 2. SYSCTL_KERN_TO_USER(dir) Writing to a user space buffer from a kernel
* variable (dir == 0).
*/
#define SYSCTL_USER_TO_KERN(dir) (!!(dir))
#define SYSCTL_KERN_TO_USER(dir) (!dir)
#define SYSCTL_USER_TO_KERN_INT_CONV(name, u_ptr_op) \
int sysctl_user_to_kern_int_conv##name(const bool *negp, \
const unsigned long *u_ptr,\
int *k_ptr) \
{ \
unsigned long u = u_ptr_op(*u_ptr); \
if (*negp) { \
if (u > (unsigned long) INT_MAX + 1) \
return -EINVAL; \
WRITE_ONCE(*k_ptr, -u); \
} else { \
if (u > (unsigned long) INT_MAX) \
return -EINVAL; \
WRITE_ONCE(*k_ptr, u); \
} \
return 0; \
}
#define SYSCTL_KERN_TO_USER_INT_CONV(name, k_ptr_op) \
int sysctl_kern_to_user_int_conv##name(bool *negp, \
unsigned long *u_ptr, \
const int *k_ptr) \
{ \
int val = READ_ONCE(*k_ptr); \
if (val < 0) { \
*negp = true; \
*u_ptr = -k_ptr_op((unsigned long)val); \
} else { \
*negp = false; \
*u_ptr = k_ptr_op((unsigned long)val); \
} \
return 0; \
}
/**
* To range check on a converted value, use a temp k_ptr
* When checking range, value should be within (tbl->extra1, tbl->extra2)
*/
#define SYSCTL_INT_CONV_CUSTOM(name, user_to_kern, kern_to_user, \
k_ptr_range_check) \
int do_proc_int_conv##name(bool *negp, unsigned long *u_ptr, int *k_ptr,\
int dir, const struct ctl_table *tbl) \
{ \
if (SYSCTL_KERN_TO_USER(dir)) \
return kern_to_user(negp, u_ptr, k_ptr); \
\
if (k_ptr_range_check) { \
int tmp_k, ret; \
if (!tbl) \
return -EINVAL; \
ret = user_to_kern(negp, u_ptr, &tmp_k); \
if (ret) \
return ret; \
if ((tbl->extra1 && *(int *)tbl->extra1 > tmp_k) || \
(tbl->extra2 && *(int *)tbl->extra2 < tmp_k)) \
return -EINVAL; \
WRITE_ONCE(*k_ptr, tmp_k); \
} else \
return user_to_kern(negp, u_ptr, k_ptr); \
return 0; \
}
#define SYSCTL_USER_TO_KERN_UINT_CONV(name, u_ptr_op) \
int sysctl_user_to_kern_uint_conv##name(const unsigned long *u_ptr,\
unsigned int *k_ptr) \
{ \
unsigned long u = u_ptr_op(*u_ptr); \
if (u > UINT_MAX) \
return -EINVAL; \
WRITE_ONCE(*k_ptr, u); \
return 0; \
}
#define SYSCTL_UINT_CONV_CUSTOM(name, user_to_kern, kern_to_user, \
k_ptr_range_check) \
int do_proc_uint_conv##name(unsigned long *u_ptr, unsigned int *k_ptr, \
int dir, const struct ctl_table *tbl) \
{ \
if (SYSCTL_KERN_TO_USER(dir)) \
return kern_to_user(u_ptr, k_ptr); \
\
if (k_ptr_range_check) { \
unsigned int tmp_k; \
int ret; \
if (!tbl) \
return -EINVAL; \
ret = user_to_kern(u_ptr, &tmp_k); \
if (ret) \
return ret; \
if ((tbl->extra1 && \
*(unsigned int *)tbl->extra1 > tmp_k) || \
(tbl->extra2 && \
*(unsigned int *)tbl->extra2 < tmp_k)) \
return -ERANGE; \
WRITE_ONCE(*k_ptr, tmp_k); \
} else \
return user_to_kern(u_ptr, k_ptr); \
return 0; \
}
extern const unsigned long sysctl_long_vals[];
typedef int proc_handler(const struct ctl_table *ctl, int write, void *buffer,
size_t *lenp, loff_t *ppos);
int proc_dostring(const struct ctl_table *, int, void *, size_t *, loff_t *);
int proc_dobool(const struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
int proc_dointvec(const struct ctl_table *, int, void *, size_t *, loff_t *);
int proc_dointvec_minmax(const struct ctl_table *table, int dir, void *buffer,
size_t *lenp, loff_t *ppos);
int proc_dointvec_conv(const struct ctl_table *table, int dir, void *buffer,
size_t *lenp, loff_t *ppos,
int (*conv)(bool *negp, unsigned long *u_ptr, int *k_ptr,
int dir, const struct ctl_table *table));
int proc_douintvec(const struct ctl_table *, int, void *, size_t *, loff_t *);
int proc_douintvec_minmax(const struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
int proc_douintvec_conv(const struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos,
int (*conv)(unsigned long *lvalp, unsigned int *valp,
int write, const struct ctl_table *table));
int proc_dou8vec_minmax(const struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
int proc_doulongvec_minmax(const struct ctl_table *, int, void *, size_t *, loff_t *);
int proc_doulongvec_minmax_conv(const struct ctl_table *table, int dir,
void *buffer, size_t *lenp, loff_t *ppos,
unsigned long convmul, unsigned long convdiv);
int proc_do_large_bitmap(const struct ctl_table *, int, void *, size_t *, loff_t *);
int proc_do_static_key(const struct ctl_table *table, int write, void *buffer,
size_t *lenp, loff_t *ppos);
int sysctl_kern_to_user_uint_conv(unsigned long *u_ptr, const unsigned int *k_ptr);
/*
* Register a set of sysctl names by calling register_sysctl
* with an initialised array of struct ctl_table's.
*
* sysctl names can be mirrored automatically under /proc/sys. The
* procname supplied controls /proc naming.
*
* The table's mode will be honoured for proc-fs access.
*
* Leaf nodes in the sysctl tree will be represented by a single file
* under /proc; non-leaf nodes will be represented by directories. A
* null procname disables /proc mirroring at this node.
*
* The data and maxlen fields of the ctl_table
* struct enable minimal validation of the values being written to be
* performed, and the mode field allows minimal authentication.
*
* There must be a proc_handler routine for any terminal nodes
* mirrored under /proc/sys (non-terminals are handled by a built-in
* directory handler). Several default handlers are available to
* cover common cases.
*/
/* Support for userspace poll() to watch for changes */
struct ctl_table_poll {
atomic_t event;
wait_queue_head_t wait;
};
static inline void *proc_sys_poll_event(struct ctl_table_poll *poll)
{
return (void *)(unsigned long)atomic_read(&poll->event);
}
#define __CTL_TABLE_POLL_INITIALIZER(name) { \
.event = ATOMIC_INIT(0), \
.wait = __WAIT_QUEUE_HEAD_INITIALIZER(name.wait) }
#define DEFINE_CTL_TABLE_POLL(name) \
struct ctl_table_poll name = __CTL_TABLE_POLL_INITIALIZER(name)
/* A sysctl table is an array of struct ctl_table: */
struct ctl_table {
const char *procname; /* Text ID for /proc/sys */
void *data;
int maxlen;
umode_t mode;
proc_handler *proc_handler; /* Callback for text formatting */
struct ctl_table_poll *poll;
void *extra1;
void *extra2;
} __randomize_layout;
struct ctl_node {
struct rb_node node;
struct ctl_table_header *header;
};
/**
* struct ctl_table_header - maintains dynamic lists of struct ctl_table trees
* @ctl_table: pointer to the first element in ctl_table array
* @ctl_table_size: number of elements pointed by @ctl_table
* @used: The entry will never be touched when equal to 0.
* @count: Upped every time something is added to @inodes and downed every time
* something is removed from inodes
* @nreg: When nreg drops to 0 the ctl_table_header will be unregistered.
* @rcu: Delays the freeing of the inode. Introduced with "unfuck proc_sysctl ->d_compare()"
*
* @type: Enumeration to differentiate between ctl target types
* @type.SYSCTL_TABLE_TYPE_DEFAULT: ctl target with no special considerations
* @type.SYSCTL_TABLE_TYPE_PERMANENTLY_EMPTY: Identifies a permanently empty dir
* target to serve as a mount point
*/
struct ctl_table_header {
union {
struct {
const struct ctl_table *ctl_table;
int ctl_table_size;
int used;
int count;
int nreg;
};
struct rcu_head rcu;
};
struct completion *unregistering;
const struct ctl_table *ctl_table_arg;
struct ctl_table_root *root;
struct ctl_table_set *set;
struct ctl_dir *parent;
struct ctl_node *node;
struct hlist_head inodes; /* head for proc_inode->sysctl_inodes */
enum {
SYSCTL_TABLE_TYPE_DEFAULT,
SYSCTL_TABLE_TYPE_PERMANENTLY_EMPTY,
} type;
};
struct ctl_dir {
/* Header must be at the start of ctl_dir */
struct ctl_table_header header;
struct rb_root root;
};
struct ctl_table_set {
int (*is_seen)(struct ctl_table_set *);
struct ctl_dir dir;
};
struct ctl_table_root {
struct ctl_table_set default_set;
struct ctl_table_set *(*lookup)(struct ctl_table_root *root);
void (*set_ownership)(struct ctl_table_header *head,
kuid_t *uid, kgid_t *gid);
int (*permissions)(struct ctl_table_header *head, const struct ctl_table *table);
};
#define register_sysctl(path, table) \
register_sysctl_sz(path, table, ARRAY_SIZE(table))
#ifdef CONFIG_SYSCTL
void proc_sys_poll_notify(struct ctl_table_poll *poll);
extern void setup_sysctl_set(struct ctl_table_set *p,
struct ctl_table_root *root,
int (*is_seen)(struct ctl_table_set *));
extern void retire_sysctl_set(struct ctl_table_set *set);
struct ctl_table_header *__register_sysctl_table(
struct ctl_table_set *set,
const char *path, const struct ctl_table *table, size_t table_size);
struct ctl_table_header *register_sysctl_sz(const char *path, const struct ctl_table *table,
size_t table_size);
void unregister_sysctl_table(struct ctl_table_header * table);
extern int sysctl_init_bases(void);
extern void __register_sysctl_init(const char *path, const struct ctl_table *table,
const char *table_name, size_t table_size);
#define register_sysctl_init(path, table) \
__register_sysctl_init(path, table, #table, ARRAY_SIZE(table))
extern struct ctl_table_header *register_sysctl_mount_point(const char *path);
void do_sysctl_args(void);
bool sysctl_is_alias(char *param);
extern int unaligned_enabled;
extern int no_unaligned_warning;
#else /* CONFIG_SYSCTL */
static inline void register_sysctl_init(const char *path, const struct ctl_table *table)
{
}
static inline struct ctl_table_header *register_sysctl_mount_point(const char *path)
{
return NULL;
}
static inline struct ctl_table_header *register_sysctl_sz(const char *path,
const struct ctl_table *table,
size_t table_size)
{
return NULL;
}
static inline void unregister_sysctl_table(struct ctl_table_header * table)
{
}
static inline void setup_sysctl_set(struct ctl_table_set *p,
struct ctl_table_root *root,
int (*is_seen)(struct ctl_table_set *))
{
}
static inline void do_sysctl_args(void)
{
}
static inline bool sysctl_is_alias(char *param)
{
return false;
}
#endif /* CONFIG_SYSCTL */
#endif /* _LINUX_SYSCTL_H */